Making the Makefile create directories

Makefile

@@ -3,11 +3,13 @@ FLAGS	= -Wall -fpic
 LFLAGS	= -s
 
 all: bin/libcatwalk.so
-	
+
 bin/libcatwalk.so: obj/directions.o obj/grid.o obj/indicators.o obj/route.o
+	-@mkdir -p $(@D)
 	$(CC) -shared -o $@ $(FLAGS) $^ $(LFLAGS)
 
 obj/%.o: src/%.c
+	-@mkdir -p $(@D)
 	$(CC) -o $@ -c $(FLAGS) $<
 
 obj/directions.o: src/directions.c
@@ -17,6 +19,6 @@ obj/route.o: src/route.c
 
 .PHONY: clean mrproper
 clean:
-	rm -f obj/*
+	rm -rf obj
 mrproper: clean
-	rm -f bin/*
+	rm -rf bin